Questions tagged [limit]

Limiting the usage of a resource (memory, disk space, CPU time, open files, network bandwidth, …) by a process or a group of processes.

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How can I limit bandwidth per connection using tc?

I am pretty new to Linux and tc command and lately I have been looking for a solution to limit bandwidth per connection using the tc command. I have a server application that handles requests from ...
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Values from sysctl -A don't match /etc/sysctl.conf even after restart

I'm on Mac Monterey 12.1 and increased my shared memory limits in /etc/sysctl.conf file: kern.sysv.shmmax: 16777216 kern.sysv.shmmin: 1 kern.sysv.shmmni: 128 kern.sysv.shmseg: 512 kern.sysv.shmall: ...
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Can't set fs.nr_open limit via sysctl

I'm trying to set fs.nr_open via sysctl (for learning purpose) to different value, other than default 1048576 These are sysctl settings after system was booted: vud@ubuntu:~$ sudo sysctl -a | grep -E '...
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Create limitations systemd service file

I wanted to set some limits for my systemd service, such as: Network bandwidth Cpu quote If the limit is over, then systemd service should stop. Thank you in advance
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How do I make a Linux process believe it is using 100% of CPU while limiting it with a cgroup?

Cgroups allow artificially limiting CPU time available to a process using cpu.cfs_quota_us and cpu.cfs_period_us parameters. This however results in a discrepancy when the program monitors its CPU ...
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OpenBSD 6.9 - ENOMEM error on execve (execvp)

I've compiled a program on OpenBSD 6.9 and when I execute the program, I get an enomem error related specifically to execvp which the man pages say is a font-end for execve. The execve man page ...
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How to get the correct device to limit block IO for docker container?

(I posted this question at stackoverflow, but maybe here is the more appropriate place, if necessary - I'll delete the other question.) I need to put a limit on block IO operations speed for a number ...
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How to best hard-limit my Firefox' memory hogging?

I use Firefox 83 on my Devuan GNU/Linux Beowulf desktop. Unfortunately, for reasons which are not clear to me, FF has memory issues which cause it to gradually take up more and more of my system's ...
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LVM 4,55 TiB Volume Group. I only can create a 2.70TiB logical volume

I create a Volume Group with 3 disks, 2 of 931g, and 1 of 2.73t. It seems like works propertly. sudo pvs PV VG Fmt Attr PSize PFree /dev/sdb nxt lvm2 a-- 931.51g 931.51g /dev/...
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Is there a file system out there that supports custom file size limit?

I'm aware that EXT4 has a max_dir_size_kb mount option to set up the max size of each directory. It doesn't have a similar option to specify the max size of individual files, though. Is somebody aware ...
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Where does the systemctl Tasks (limit=) come from and can I temporarily change it?

I am having trouble with Tomcat 9, openjdk 11.0.9.1 on ubuntu 18.04. I installed it using these instructions: https://linuxize.com/post/how-to-install-tomcat-9-on-ubuntu-18-04/ It worked fine for a ...
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limits.conf not working for SSH connections on Fedora 33

I am trying to set a limit on a group called rlimited. I have the following in my /etc/security/limits.conf @rlimited hard cpu 5 The same file exists in the /etc/security/limits.d/ folder. I've also ...
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rhel 7 setting stack size to unlimited

I have some old code that needs the stack to not be limited to 8192kb in order for it to run. I am used to doing this in /etc/security/limits.conf * stack hard unlimited * stack soft ...
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Limit bandwidth for outgoing/incoming with latency for specific port using TC

I'm trying to limit the incoming and outgoing bandwidth with latency through a specific port using TC but I can't get it to work 100%. I'm not sure if I've done it correctly. When I ping google, the ...
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Linux Directory Size Limiting

I have a FTP server with anonymous access for my local network. Here I have directories named with department names. I want to limit the directory sizes in respect to departments. /var/ftp/pub/ ...
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Stop specific processes from heating up my system's CPU

I have a process doing some computation the whole time. It causes my system's CPU to heat up and the fan to spin faster. I want this process to run, but with a low priority. I don't want my system to ...
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"Too Many Open Files" for Apache and java/tomcat. How to set per-process limits?

This problem has now appeared twice on my production Ubuntu machine running both a node server (tiny) and a Spring Boot Java server (the workhorse). The first time it happened, grinding my server to a ...
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1 answer
566 views

Is there a limit for the read command?

I'm trying to write a bash script that will let me save a backup code (lots of numbers) in a file. I've finished the script but it's only letting me to save 4096 digits of the code. I tried to do this:...
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How can I limit both pty and non-pty ssh sessions to 'maxlogins'?

I have a normal Linux user that is: only allowed to login via ssh to execute a single command and nothing else may never login more the once at a single time The first restriction is implemented ...
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How can I limit the CPU usage (% of CPU)?

It happened to me multiple times now that a program which entered an infinite loop made the entire machine completely unresponsive, one time even foreign JavaScript, and I had to power off. This is ...
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1 answer
779 views

AMDGPU driver vramlimit

I have a console installation of debian and i found that from the available 16GB of ram i can see only 14GB, this is because my APU (AMD) is reserving 2GB which is way too much for my needs. The bad ...
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3 votes
1 answer
63 views

Linux not enforcing limits correctly?

As an experiment on a test system, I tried to limit my own number of processes using /etc/security/limits.conf. When logged on the system I had 16 processes to my name running (all had ruid, euid and ...
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Limits of tmpfs filesystem

What are the limits of the tmpfs filesystem in terms of: Maximum file size Maximum file system size Maximum subdirectories Maximum symlink depth I'm using a centOS 8. The tmpfs is mounted via: [...
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1 answer
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Not able to increase ulimit -Hn, only shows up for a sudo su session

So I am trying to change my hard limit for file descriptors on Ubuntu18.04 laptop. I have tried everything but the changes have still not taken effect. I need to run a go program which keeps throwing ...
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Unable to login to a user(oracle) "error: resource temporary unavailable"

When I try to login to oracle via ssh or su - oracle it shows following error **error:resource temporary unavailable** CPU Memory & IOps utilization is normal
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How can df report different information depending in it's target path?

Example: root@myinstance:/my/instance/path# df -h Filesystem Size Used Avail Use% Mounted on ... /dev/mapper/hdd-place 13T 899G 12T 8% /run/iss ... root@myinstance:/my/instance/...
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"Xorg" process does not take limits from /etc/security/limits.conf

I have this in my /etc/security/limits.conf: #<domain> <type> <item> <value> root - memlock 65536 root - stack 524288 root ...
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limits.conf nproc not being applied

this is our limits.conf * soft nofile 999999 * hard nofile 999999 * soft noproc 256000 * hard noproc 256000 and then we check for the changes after a reboot, ...
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3 votes
1 answer
443 views

How to "soft-limit" CPU usage of a process

I have some processes running on Debian that I want to limit cpu of it usage in the "soft" manner. For example, if it eats more than 70% of a single core for more than 15 minutes, the CPU ...
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1 answer
372 views

limits.conf is not working

I'm trying to set default niceness/priority for a user's processes on Ubuntu 18.04.3 LTS in limits.conf and everything I write in limits.conf is simply ignored. Hard nice, soft nice, hard priority, ...
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4 votes
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560 views

Processes started through SSH add up to limit of SSH Daemon (systemd)

on a productive server there are (background) processes started by users which connect through SSH and run some scripts. These processes are daemons and keep on running. Each started process is found ...
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1 answer
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Is it possible to impose a minimum niceness on a specific user?

Is it possible to limit a specific user's processes to always run with a niceness of at least 15, say?
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2 votes
1 answer
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Limit bandwidth on a specific port in CentOS 7?

I am running CentOS 7 on my VPS and I would like to limit bandwidth on a specific port. I have looked around extensively, and out of the solutions I can find, either it's a limit placed on an ...
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Restricted shell within docker container

Some context for my question: I am working on a pty NodeJS server running in docker where I want to provide users connecting to the shell an isolated environment where they can play around with ...
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1 vote
0 answers
297 views

Limit container resources both using --memory and --cgroup-parent

I'd like to limit both total memory consumption for a group of containers as well as memory consumption for a particular container. Say, a container is allowed to consume not greater than 1Gb and all ...
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Setting soft limit above hard does not fail in terms of exit code?

root@Andromeda:/# ulimit -n -S 2048 root@Andromeda:/# ulimit -n -H 2048 root@Andromeda:/# ulimit -n -S 4096 2048 root@Andromeda:/# echo $? 0 Failure to set soft limit above the hard one makes sense. ...
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5 votes
1 answer
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dash maximum variable length under systemd

I have a shell script that uses a single variable as an associative array (one KEY=VALUE per line). Throughout the execution of the script, the variable is manipulated to add, remove or modify ...
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1 answer
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Change max line length of GNU parallel

The following command: parallel --max-line-length-allowed returns 131049. Is this a constant, or can I somehow change this limit?
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1 vote
1 answer
627 views

Limit on continuously writing to a log file

I am using Debian running on a BeableBone Black with 4GB of internal flash storage. My program is continuously writing / appending to a log file that I created with >> every minute, all day ...
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1 answer
1k views

Open file limits not increased for redis user despite change in /etc/security/limits.conf

I got ERR max number of clients reached from my redis server so I decidied to increase the allowed max client connections in its configuration. This also requires according to the documentation, ...
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1 vote
1 answer
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Download error with youtube-dl and axel

I am trying to download following video: https://www.youtube.com/watch?v=pQWj2Fgxdrc by combining 'youtube-dl' and 'axel'. I am trying to download this video in such a way that I want these two ...
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23 votes
1 answer
13k views

How to limit a systemd service to "play nice" with the CPU?

I have a systemd service (a CI runner) that tends to bog the system down with very CPU intensive jobs. I caught the load average flying over 100 just now and want to put a stop to that nonsense. ...
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2 votes
0 answers
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Restart a process if cpu usage is more than 90% for more than a 60sec

Normally one of my systemd services will take about 0...5% cpu Usage. In some cases it can reach up to 100% but only for some seconds. If the Service "crashes" it takes up to 100% continuously. So I ...
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Launch a program to only specific resources

Question: How can I launch a program such that it only uses X ram and Y CPU cores, etc? I happen to be using Ubuntu in this case, but since I often am on other distros, I need a general GNU/Linux ...
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2 votes
1 answer
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What is the maximum open files limit?

I'm working on a reasonably large project, and recently had to bump the nofile setting above 500,000. I tried to change it to five million in /etc/security/limits.d/99-users-nofile.conf, but ...
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11 votes
1 answer
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max no of tcp connections on a linux system

I know that /etc/security/limits.conf provides the persistent soft and hard limits for several values. However, in the relevant list there is no indication about imposed limits on: a) concurrent ...
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1 answer
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cgroups: Is it possible to limit cpu usage by process name instead of by pid

As we know, cgroups can limit cpu usage of processes. Here is an example: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 30142 root 20 0 104m 2520 1024 R 99.7 ...
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2 answers
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Preventing un tar from using too much CPU

I am running un tar i.e tar xzvf abc.tar.gz on Beaglebone green. This seems to be using too much CPU. When a untar operation is in progress, i see via top command the CPU usage.. not sure why it seems ...
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324 views

Is there a way to restrict the application access to the system time in linux?

Is there a way to restrict the application access to the system time in linux? I want to make the application launch as much as possible abstracted from the environment. If you can restrict access to ...
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9 votes
1 answer
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ulimit vs file-max

Could someone explain limit on open files in linux? The problem is that one of my applications if reporting "Too many open files". I have ulimit -n 1024 but cat /proc/sys/fs/file-max 6578523 and ...
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